INSTALLATION AND OPERATION LOAD SHARING MODULE Appendix A. - LSM Control Specifications Caterpillar

Appendix A. - LSM Control Specifications

POWER SUPPLY = 18-32 Vdc, approximately 5 W. Protected against undervoltage, overvoltage to +80 Vdc, reverse voltage to -32 Vdc.


3-phase PT inputs = 100-240 Vac line-to-line, 50-400 Hz. PT input burden is between 1.5 VA and 1.7 VA per phase at 240 Vac, and between 0.4 VA and 0.5 VA per phase at 120 Vac

3-phase CT inputs = 3-7 Arms at full load, CT input burden at full load is 0.1 VA per phase.

Load Sharing Input = 0-3 Vdc into 25 k ohms impedance in isochronous mode, open circuit in droop mode.

Sync Input = Compatible with optional Woodward SPM-A Synchronizer, 0.38% speed change* per volt input.

Speed Trim = ± 10 % minimum speed change* with an external 10 k ohm potentiometer.

Droop Switch = The external droop switch is to be wired in series with the auxiliary circuit breaker contact between terminals 13 and 14. Droop mode is selected when either the droop switch or the auxiliary circuit breaker is open.


Load Signal = DC signal proportional to total real current measured by the Load Sharing Module. Load Gain adjustable over minimum range of 0.86 to 2.0 Vdc/Arms.

PWM Output = Pulse width modulated square wave, 500 ± 100 Hz. Zero error output duty cycle + 69.8 ± 2.0 %. Minimum V (hi) + 10.0 Vdc, maximum V (lo) = 0.5 Vdc when driving external 5.1 K load to 13.0 Vdc external pull-up.


Droop = Provides 0 to 9% speed reduction* between no load and full load conditions.

Load Gain = Provides adjustment of the load on an individual generator when two or more generators are paralleled. Adjusts specified full load condition from 3 to 7 Arms.


Operating Temperature = -40 to +70°C (-40 to +158°F)

Salt Fog = Tested at 5% NaCl, 35°C, 48 hrs wet, 48 hrs dry

Humidity = Tested at 95% RH, 65°C, non-condensing, 5 cycles at 24 hr/cycle.

Vibration = Swept sine: 4 G, 5 mm, 5-2000 Hz, 3 hr min/axis, including four 30-minute dwells at resonant frequencies.

Shock = 40 G, 11 ms sawtooth pulse.

Installation Overvoltage Category = Category III

Air Quality = Pollution Degree 2.


Linear (maximum) = Length: 273.6 mm (10.77 in), Width: 214.1 mm (8.43 in), Height: 59.2 mm (2.33 in)

Weight = 1397 g (49.3 oz) approximate


Conforms to EMC Directive 89/336/EEC. Conformity established by testing.

Conforms to Low Voltage Directive 73/23/EEC when used in accordance with instructions. Conformity established by testing.

Listed to UL and cUL Industrial Control Equipment (UL508).

*-When used with a speed control having a gain of 0.382% speed change per 1% duty cycle change.

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